Change builder docker to use Qt 5.12.7 from ppa
Change builder docker to use Qt 5.12.7 from ppa

because Qt pre-built binaries cannot now be downloaded from qt.io

iakov/trikRuntime,iakov/trikRuntime,iakov/trikRuntime,iakov/trikRuntime,trikset/trikRuntime,trikset/trikRuntime,iakov/trikRuntime,trikset/trikRuntime,trikset/trikRuntime,trikset/trikRuntime